| 1 | /* This file takes care of those system calls that deal with time.
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| 2 | *
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| 3 | * The entry points into this file are
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| 4 | * do_utime: perform the UTIME system call
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| 5 | * do_stime: PM informs FS about STIME system call
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| 6 | */
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| 7 |
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| 8 | #include "fs.h"
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| 9 | #include <minix/callnr.h>
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| 10 | #include <minix/com.h>
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| 11 | #include "file.h"
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| 12 | #include "fproc.h"
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| 13 | #include "inode.h"
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| 14 | #include "param.h"
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| 15 |
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| 16 | /*===========================================================================*
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| 17 | * do_utime *
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| 18 | *===========================================================================*/
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| 19 | PUBLIC int do_utime()
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| 20 | {
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| 21 | /* Perform the utime(name, timep) system call. */
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| 22 |
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| 23 | register struct inode *rip;
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| 24 | register int len, r;
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| 25 |
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| 26 | /* Adjust for case of 'timep' being NULL;
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| 27 | * utime_strlen then holds the actual size: strlen(name)+1.
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| 28 | */
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| 29 | len = m_in.utime_length;
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| 30 | if (len == 0) len = m_in.utime_strlen;
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| 31 |
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| 32 | /* Temporarily open the file. */
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| 33 | if (fetch_name(m_in.utime_file, len, M1) != OK) return(err_code);
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| 34 | if ( (rip = eat_path(user_path)) == NIL_INODE) return(err_code);
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| 35 |
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| 36 | /* Only the owner of a file or the super_user can change its time. */
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| 37 | r = OK;
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| 38 | if (rip->i_uid != fp->fp_effuid && !super_user) r = EPERM;
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| 39 | if (m_in.utime_length == 0 && r != OK) r = forbidden(rip, W_BIT);
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| 40 | if (read_only(rip) != OK) r = EROFS; /* not even su can touch if R/O */
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| 41 | if (r == OK) {
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| 42 | if (m_in.utime_length == 0) {
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| 43 | rip->i_atime = clock_time();
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| 44 | rip->i_mtime = rip->i_atime;
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| 45 | } else {
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| 46 | rip->i_atime = m_in.utime_actime;
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| 47 | rip->i_mtime = m_in.utime_modtime;
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| 48 | }
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| 49 | rip->i_update = CTIME; /* discard any stale ATIME and MTIME flags */
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| 50 | rip->i_dirt = DIRTY;
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| 51 | }
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| 52 |
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| 53 | put_inode(rip);
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| 54 | return(r);
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| 55 | }
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| 56 |
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| 57 | /*===========================================================================*
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| 58 | * do_stime *
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| 59 | *===========================================================================*/
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| 60 | PUBLIC int do_stime()
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| 61 | {
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| 62 | /* Perform the stime(tp) system call. */
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| 63 | boottime = (long) m_in.pm_stime;
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| 64 | return(OK);
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| 65 | }
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| 66 |
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